Rights statement: This is the author’s version of a work that was accepted for publication in Journal of Building Engineering. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Journal of Building Engineering, 43, 2021 DOI: 10.1016/j.jobe.2021/103159
Accepted author manuscript, 1.36 MB, PDF document
Available under license: CC BY-NC-ND: Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License
Final published version
Research output: Contribution to Journal/Magazine › Journal article › peer-review
| Article number | 103159 |
|---|---|
| <mark>Journal publication date</mark> | 30/11/2021 |
| <mark>Journal</mark> | Journal of Building Engineering |
| Volume | 43 |
| Number of pages | 12 |
| Publication Status | Published |
| Early online date | 3/09/21 |
| <mark>Original language</mark> | English |
In this paper, systematic supercritical carbonation tests of steel-polypropylene hybrid fiber reinforced concrete (SPFRC) were carried out to evaluate the performance of SPFRC under supercritical condition. The effects of the length-diameter ratio of steel fiber, volume fraction of steel fiber, and polypropylene fiber on the carbonation depth and compressive strength of concrete under supercritical condition were studied. A one-dimensional mathematical model for the physical-chemical coupling process of supercritical carbonation of cement-based materials was established. The relational model between the equivalent porosity and the compressive strength of fully carbonated SPFRC was also proposed. Results indicate that whether the addition of steel fibers or polypropylene fibers or the inclusion of fibers can accelerate the carbonation process by the increase of porosity. The carbonation depths of SPFRC increase with the increase of the addition of steel fibers and polypropylene fibers. The compressive strength after carbonation is significantly increased. The maximum relative compressive strength was obtained when the volume fraction of steel fibers and polypropylene fibers were 1.5% and 0.0% and the length-diameter ratio of steel fiber was 60, respectively. Furthermore, a mathematical model was proposed to evaluate the equivalent initial porosity of SPFRC.